Permutations Calculator
P(n,r) — order matters
Combinations count ways to choose items where order does not matter. Permutations count ways where order does matter. Both use factorials and appear in probability, statistics, and combinatorics.
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Fun Fact
There are C(52,5) = 2,598,960 possible 5-card poker hands from a standard deck, but only 4 are Royal Flushes — odds of 1 in 649,740.
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